assimp/include/export.hpp

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/** @file  export.hpp
*  @brief Defines the CPP-API for the Assimp export interface
*/
#ifndef AI_EXPORT_HPP_INC
#define AI_EXPORT_HPP_INC

#ifndef ASSIMP_BUILD_NO_EXPORT

#include "export.h"

namespace Assimp	{
	class ExporterPimpl;

// ----------------------------------------------------------------------------------
/** CPP-API: The Exporter class forms an C++ interface to the export functionality 
 * of the Open Asset Import Library. Note that the export interface is available
 * only if Assimp has been built with ASSIMP_BUILD_NO_EXPORT not defined.
 * 
 * The interface is modelled after the importer interface and mostly
 * symmetric. The same rules for threading etc. apply.
 *
 * In a nutshell, there are two export interfaces: #Export, which writes the
 * output file(s) either to the regular file system or to a user-supplied 
 * #IOSystem, and #ExportToBlob which returns a linked list of memory
 * buffers (blob), each referring to one output file (in most cases
 * there will be only one output file of course, but this extra complexity is
 * needed since Assimp aims at supporting a wide range of file formats). 
 * 
 * #ExportToBlob is especially useful if you intend to work 
 * with the data in-memory. 
*/
class ASSIMP_API Exporter
	// TODO: causes good ol' base class has no dll interface warning
//#ifdef __cplusplus
//	: public boost::noncopyable
//#endif // __cplusplus
{
public:

	
	Exporter();
	~Exporter();

public:


	// -------------------------------------------------------------------
	/** Supplies a custom IO handler to the exporter to use to open and
	 * access files. 
	 * 
	 * If you need #Export to use custom IO logic to access the files, 
	 * you need to supply a custom implementation of IOSystem and 
	 * IOFile to the exporter. 
	 *
	 * #Exporter takes ownership of the object and will destroy it 
	 * afterwards. The previously assigned handler will be deleted.
	 * Pass NULL to take again ownership of your IOSystem and reset Assimp
	 * to use its default implementation, which uses plain file IO.
	 *
	 * @param pIOHandler The IO handler to be used in all file accesses 
	 *   of the Importer. 
	 */
	void SetIOHandler( IOSystem* pIOHandler);

	// -------------------------------------------------------------------
	/** Retrieves the IO handler that is currently set.
	 * You can use #IsDefaultIOHandler() to check whether the returned
	 * interface is the default IO handler provided by ASSIMP. The default
	 * handler is active as long the application doesn't supply its own
	 * custom IO handler via #SetIOHandler().
	 * @return A valid IOSystem interface, never NULL.
	 */
	IOSystem* GetIOHandler() const;

	// -------------------------------------------------------------------
	/** Checks whether a default IO handler is active 
	 * A default handler is active as long the application doesn't 
	 * supply its own custom IO handler via #SetIOHandler().
	 * @return true by default
	 */
	bool IsDefaultIOHandler() const;



	// -------------------------------------------------------------------
	/** Exports the given scene to a chosen file format. Returns the exported 
	* data as a binary blob which you can write into a file or something.
	* When you're done with the data, simply let the #Exporter instance go 
	* out of scope to have it released automatically.
	* @param pScene The scene to export. Stays in possession of the caller,
	*   is not changed by the function.
	* @param pFormatId ID string to specify to which format you want to 
	*   export to. Use 
	* #GetExportFormatCount / #GetExportFormatDescription to learn which 
	*   export formats are available.
	* @return the exported data or NULL in case of error.
	* @note If the Exporter instance did already hold a blob from
	*   a previous call to #ExportToBlob, it will be disposed. 
	*   Any IO handlers set via #SetIOHandler are ignored here.*/
	const aiExportDataBlob* ExportToBlob(  const aiScene* pScene, const char* pFormatId );
	inline const aiExportDataBlob* ExportToBlob(  const aiScene* pScene, const std::string& pFormatId );


	// -------------------------------------------------------------------
	/** Convenience function to export directly to a file. Use
	 *  #SetIOSystem to supply a custom IOSystem to gain fine-grained control
	 *  about the output data flow of the export process.
	 * @param pBlob A data blob obtained from a previous call to #aiExportScene. Must not be NULL.
	 * @param pPath Full target file name. Target must be accessible.
	 * @return AI_SUCCESS if everything was fine. */
	aiReturn Export( const aiScene* pScene, const char* pFormatId, const char* pPath );
	inline aiReturn Export( const aiScene* pScene, const std::string& pFormatId, const std::string& pPath );



	// -------------------------------------------------------------------
	/** Return the blob obtained from the last call to #ExportToBlob */
	const aiExportDataBlob* GetBlob() const;


	// -------------------------------------------------------------------
	/** Orphan the blob from the last call to #ExportToBlob. This means
	 *  the caller takes ownership and is thus responsible for calling
	 *  #aiReleaseExportData to free the data again. */
	const aiExportDataBlob* GetOrphanedBlob() const;


	// -------------------------------------------------------------------
	/** Returns the number of export file formats available in the current
	 *  Assimp build. Use #Exporter::GetExportFormatDescription to
	 *  retrieve infos of a specific export format */
	size_t GetExportFormatCount() const;


	// -------------------------------------------------------------------
	/** Returns a description of the nth export file format. Use #
	 *  #Exporter::GetExportFormatCount to learn how many export 
	 *  formats are supported. 
	 * @param pIndex Index of the export format to retrieve information 
	 *  for. Valid range is 0 to #Exporter::GetExportFormatCount
	 * @return A description of that specific export format. 
	 *  NULL if pIndex is out of range. */
	const aiExportFormatDesc* GetExportFormatDescription( size_t pIndex ) const;


protected:

	// Just because we don't want you to know how we're hacking around.
	ExporterPimpl* pimpl;
};


// ----------------------------------------------------------------------------------
inline const aiExportDataBlob* Exporter :: ExportToBlob(  const aiScene* pScene, const std::string& pFormatId ) 
{
	return ExportToBlob(pScene,pFormatId.c_str());
}

// ----------------------------------------------------------------------------------
inline aiReturn Exporter :: Export( const aiScene* pScene, const std::string& pFormatId, const std::string& pPath )
{
	return Export(pScene,pFormatId.c_str(),pPath.c_str());
}

} // namespace Assimp
#endif // ASSIMP_BUILD_NO_EXPORT
#endif // AI_EXPORT_HPP_INC